
Product Description
Emerson KJ3225X1-BA1 RTD/Resistance Input Card for DeltaV Systems
The Emerson KJ3225X1-BA1 (part number 12P4174X032) is a precision RTD and resistance input card engineered for accurate temperature and resistance measurement in DeltaV distributed control systems. Designed for demanding process industries, this I/O module converts RTD sensor signals—including Pt100, Pt1000, and custom resistance elements—into digital values for real-time monitoring, control, and alarming across refining, chemical, pharmaceutical, and power generation applications.
Core Capabilities
- Universal RTD Compatibility: Supports 2-wire, 3-wire, and 4-wire RTD configurations including Pt100, Pt1000, Ni120, Cu10, and custom resistance ranges
- High-Accuracy Measurement: Factory-calibrated for ±0.1°C accuracy (typical) with automatic cold junction compensation and lead resistance cancellation
- DeltaV Native Integration: Plug-and-play compatibility with M-series and S-series I/O carriers—auto-detected by DeltaV Explorer for instant configuration
- Rugged Industrial Design: Operates reliably from -40°C to +70°C in harsh environments with ISA-S71.04 Class G3 contaminant resistance
- Maintenance-Free Operation: No user calibration required; sealed construction with no serviceable parts ensures long-term stability
Application Solutions
Turbine Bearing Temperature Monitoring: Connect multiple RTD probes to monitor bearing metal temperatures in gas turbines, steam turbines, and compressors. The KJ3225X1-BA1's fast response time and high accuracy enable early detection of thermal anomalies before catastrophic failure.
Reactor Temperature Profiling: Deploy in multi-zone chemical reactors to measure temperature gradients across catalyst beds. Integrate with DeltaV control strategies for precise exothermic reaction control and product quality optimization.
Heat Exchanger Efficiency Optimization: Monitor inlet/outlet temperatures on shell-and-tube exchangers to calculate real-time heat transfer efficiency. Use resistance inputs for custom thermistor-based fouling detection algorithms.
Pharmaceutical Clean Room Monitoring: Track ambient and process temperatures in GMP-compliant environments. The module's IP20 rating and non-condensing humidity tolerance suit controlled-atmosphere applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | KJ3225X1-BA1 / 12P4174X032 |
| Input Type | RTD (2/3/4-wire), Resistance (custom ranges) |
| Supported RTDs | Pt100, Pt1000, Ni120, Cu10, custom |
| Accuracy | ±0.1°C typical (RTD-dependent) |
| Power Consumption | 12 VDC @ 160 mA (local bus) |
| Operating Temp | -40°C to +70°C |
| Humidity Range | 5% to 95% RH, non-condensing |
| Shock Resistance | 10 g ½-sine wave, 11 ms duration |
| Vibration Tolerance | 1 mm p-p (2–13.2 Hz); 0.7 g (13.2–150 Hz) |
| Contaminant Rating | ISA-S71.04-1985 Class G3 |
| Protection Rating | IP20 |
| Terminal Block Key | Position C3 (rotary keying system) |
Installation & Safety Compliance
The KJ3225X1-BA1 mounts directly into DeltaV 8-wide I/O carriers via a keyed terminal block (position C3) that prevents incorrect card-to-terminal pairing. For hazardous area installations, consult Document 12P2046 (DeltaV Scalable Process System Zone 2 Installation Instructions) and the DeltaV M-Series Hardware Installation and Reference Manual.
Hot-Swap Guidelines: The module may be inserted or removed while the system is powered only in non-hazardous areas. Remove or insert one card at a time to maintain system integrity. For Zone 2 / Class I Division 2 installations, perform I/O loop energy assessments per IEC/NEC requirements before live maintenance.
Operational Advantages
Zero Calibration Maintenance: Unlike legacy RTD input cards requiring periodic calibration, the KJ3225X1-BA1 ships factory-calibrated with drift-compensated circuitry. This eliminates annual calibration downtime and reduces lifecycle costs.
Automatic Sensor Diagnostics: DeltaV continuously monitors for open circuits, short circuits, and out-of-range resistance values. Diagnostic alarms trigger immediately upon sensor failure, enabling predictive maintenance and reducing unplanned shutdowns.
Seamless Redundancy Integration: Pair with redundant I/O carriers for fault-tolerant temperature measurement in SIL-rated safety systems. The module's deterministic response time supports Safety Instrumented Functions (SIF) when configured per IEC 61511.
Why Choose KJ3225X1-BA1?
Emerson's DeltaV I/O ecosystem is proven in over 20,000 installations worldwide. The KJ3225X1-BA1 combines precision analog front-end design with robust environmental protection, making it ideal for applications where temperature measurement accuracy directly impacts product quality, energy efficiency, and personnel safety. Its maintenance-free design and DeltaV native integration reduce total cost of ownership compared to third-party signal conditioners.
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